Use our REI Lightweight Fleece Liner inside your mummy sleeping bag for added warmth or use it as a sleep sheet while traveling. Adds 10deg F of warmth to your sleeping bags comfort rating. Soft, non-pilling polyester microfleece provides good thermal retention, continuing to insulate even if wet. Minimize wear and tear of your mummy sleeping bag by sliding liner inside-keeps bag clean, too Use liner alone when snoozing in questionable hotel rooms or hostels. Features drawstring around hood and snap closure. Comes with nylon stuff sack.